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Related Experiment Videos

Interaction between Hg(II) and natural dissolved organic matter: a fluorescence spectroscopy based study.

X Lu1, R Jaffe

  • 1Environmental Geochemistry Group, Southeast Environmental Research Center and Department of Chemistry, Florida International University, Miami, FL 33199, USA.

Water Research
|May 2, 2001
PubMed
Summary

Dissolved organic matter (DOM) in Florida Everglades surface waters binds to mercury (Hg(II)). This mercury-DOM complex can be removed from water by adsorption onto calcium carbonate (CaCO3).

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Area of Science:

  • Environmental Chemistry
  • Aquatic Chemistry
  • Spectroscopy

Background:

  • Mercury (Hg(II)) is a toxic heavy metal pollutant.
  • Dissolved organic matter (DOM) plays a crucial role in mercury's fate and transport in aquatic ecosystems.
  • Florida Everglades surface waters contain diverse DOM sources, including mangrove leaves, sawgrass, and periphyton.

Purpose of the Study:

  • To investigate the complexation interaction between Hg(II) and DOM from Florida Everglades.
  • To determine the influence of DOM structure and environmental factors on Hg(II) complexation.
  • To explore potential removal mechanisms for DOM-Hg(II) complexes.

Main Methods:

  • Fluorescence spectroscopy (emission and synchronous fluorescence) was employed to study Hg(II)-DOM interactions.

Related Experiment Videos

  • The modified Stern-Volmer equation was used to estimate conditional stability constants and binding site percentages.
  • Experimental conditions including pH, chloride concentration, and divalent cations (Ca2+, Mg2+) were varied.

    • Main Results:

    • Fluorescence quenching confirmed complexation between Hg(II) and various DOM types (degraded and fresh).
    • Synchronous fluorescence spectra provided insights into DOM structure and potential Hg(II) binding sites.
    • Complexation was influenced by pH, chloride, Ca2+, and Mg2+.
    • DOM-Hg(II) complexes showed potential for removal via adsorption onto biogenic CaCO3.

    Conclusions:

    • Everglades DOM effectively complexes Hg(II), influencing its bioavailability and transport.
    • Environmental factors significantly modulate mercury complexation with DOM.
    • Biogenic calcium carbonate precipitation offers a plausible pathway for removing mercury-DOM complexes from the water column.